Paper-cutting machine



och-1, 1929. SEYB LD 1,729,688

PAPER CUTTING MACHINE Filed Dec. 31, 1926 5 Sheets-Sheet l V I IIINV'ENYSTO-R. m 4 M A TTORNE Y.

Oct. 1, 1929. c. SEYBOLD 1,729,688

PAPER CUTTING MACHINE Filed Dec. 51, 1926 3 Sheets-Sheet 2 I INVEN TOR.141 4 M A TTORNE Y.

Oct 1, 1929. Q SEYBQLD 1,729688 PAPER CUTTING MACHINE Filed Dec. 31,1,926 3 Sheets-Sheet 5 5&4 d47INVENTOR. W

A TTORNEY.

Patented Oct. 1, 1929 UNITED STATES PATENT OFFICE CHARLES sEYBo D, orDAY'rO OHIO, ASSIGNOR To run HARRIS-SEYBOLD-POTTER COMPANY, or DAYTO OHIA CORPORATION or DELAWARE PAPER-=CUTTING MACHINE Application filedDecember 31, 1926. Serial No. 158,326.

My invention relates to the clamping mechanism for power aper cuttingmachines in which the clamp or holding the paper under the action of thecutting knife is actuated by direct spring pressure from the maindriving mechanism of the machine without the intervention of anyfriction clutch mechanism to hold the clamp to its work when the maximumclamp pressure has been attained. The invention consists in that certainnovel construction and arrangement of parts to be hereinafter moreparticularly pointed out and claimed, and in the main consists of arearrangement and reconstruction of the clamping mechanism embodying theprinciples set forth in my Patent #1,57 5,649 of March 9, 1926, wherebymuch more eflicient and satisfactory results are attained especiallywith paper cutters of large size and extreme width of cutting knife.

In the drawings Figure 1 is a side elevation of the machine. Figure 2 isa side elevation of the main pivotal frame and operating parts of themechanism.

Figure 3 is a plan view of the brake controlling devices.

' Figure 4 is a detail end elevation illustrating the clamp pressurespring and its connections.

Figure 5 is a detail side elevation of the main pivotal frame.

Figure 6 is a detail side elevation of the pressure lever. Figures 7 and8 are respectively a. side elevation and Ian view of the brake shoe.

In the rawings I have only illustrated such parts of the complete papercutting machine as may be necessary to show the application of myimproved 0 amp pressure mechanism to an Ordinary paper cutter, and itwill be understood that the mechanism can be applied to a great varietyof familiar types of machines.

As illustrated, 1 are the substantial base standards in which is mountedthe various working parts, 2 is thecutting table, 2" the shaft 5 carriedby this bracket is pivoted a main rocking frame 6 (shown by itself inFig. 5). A pair of fiat hangers 7 are also pivotally mounted on shaft 5which hangers carry at the lower end rollers 8 and 9, the roller 8 beingin contact with the cam 10 mounted on the power driven shaft 11 of themachine. The other roller 9 is in contact with the inclined end of thepressure lever 12 pivoted in the stud opening 13 on the main rock frame6. To hold these parts firmly in position during the first rockingmovement of the frame 6, as will be later described, the pressure lever12 is provided with a U- shaped hanger 14 pivoted at 15, in which issuspended a coiled spring 16 which has its upper bearing at 17 on thehorizontal extension of the rocking frame 6. A tie rod 18 also connectsthe knuckle 19 of the frame 6 with the horizontal extension to giveadditional rigidity to the frame.

The clamping pressure is applied through the clamp pressure s ring 20which is suspended in a U-shape hanger 21 mounted at the outer end 22 ofthe pressure lever 12. The upper end of the spring rod of this 5 ring isswiveled on the fiat links 23 whic are hinged at 24 to the frame 6. Fromthis swivel 25 are hung the pull bars 26 which hook below the pair ofpressure beams 27 which is fulcrumed in the stud 28 on the lower end ofthe frame 6. The noses 29 of these pressure beams bear against roller 30mounted in the lower end of a crank lever 31 keyed on the clamp shaft 32mounted in the main frame. On each end of this clamp shaft 32 whichextends from side to side of the machine is keyed a clam lever 33 whichis connected to'the pull inks 34 at each end of the paper clamp bar 3.

To vary the pressure ap lied to the pressure beam 27, the lower anti; ofthe pull bars 26 are supplied with a U iron 34' carrying pins 35 and theupper ed e of the beam 27 1s rovided with a series 0 square notches-586.

y raising the U-iron the pins 35 may be dro ped into any notch desiredto inc loasn or iminish the leverage of the pressure beam 27 by shiftingthe lifting position of the pull bars 26 along the beam shoe 41fulcrumed at 42 (Figs. 7 and 8) in a brake shoe holder 43 which ispivoted on the pin 44 in the rock frame 6. A'spring pin 45 mounted in asocket piece 46 in the holder 43 bears against a plate 47 on the rockframe 6. The brake shoe 41 is normally held out of engagement with thebrake wheel 40 by a lift rod 48 coupled to the brake holder in'the slot48 in the frame 6 with its lower end resting on a lug 49 on the pressurelever 12 when this lever is pressed into engagement with the set screw50 on the rock frame 6.

When the pressure lever is rocked to apply pressure to the clamp, thelift rod is released and the sprin pin 45 rocks the brake holder'andforces the brake shoe into engagement with the brake wheel, thuspositively looking the rock frame 6 in its position and preventing anybackward motion induced on it by the back pressure of the springs 16 and20 on the pressure lever 12 and pressure beam 27. v

The operation of the mechanism is as follows :Upon throwing in theclutch on the driving shaft 11 the cam 10 begins to rotate in aclockwise'direction in engagement with theroller 8, and the rock frame12 and all the parts mounted on it are rocked as a unit on shaft 5. Ifthere is no paper pile positioned under the clamp the parts rotate as aunit and the nose 29 on the pressure beam 27 bears against the roller30in the crank lever 31 and the clamp lever pulls links 34 bringing theclamp down to the table. After the clamp has reached the table the camstroke can no longer rock the frame 6, but the remainder of the camstroke will then rock the pressure lever 12. As this lever recedes fromthe set screw 50 the brake shoe 41 comes into engagement with the brakewheel on'the pinions 38, and the rock frame 6 is locked in its advancedposition, with the spring 20 transmitting f its pressure through thepull bars 26 and the pressure beam 27 to the clamp. Upon reaching thedwell of the cam all members of the clamping mechanism are atrest. Asthe cam continues to rotate the clamping pressure is adually released,the pressure lever 12 'is orced by the spring 16 to return to its normalposition in contact with the set screw 50 which re lieves the clampingpressure, and the clamp is returned to its raised position by a suitablecounter weight.

When it is desired for light pressure work to prevent the brake shoefrom operating, I

provide a hook 51 which is pivoted at 52 on the upper end of the plate47 on rock frame 6 and arranged to engage a pin 53 on the brake shoeholder. This hook is only used for looking out thebrake when lightclamping ressure is desired, which would not cause the ocking pinions toreverse.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is V 1, In a-clamp actuating device for powerpapucutting machines, a clamp, a rock shaft having connecting meansforactuating the clamp, apressure beam in. engagement with I theroclgshaft,a rocking frame, a pressure leverpivotally 1 mounted on the rockingframe, a spring exerting pressure on one end of the pressure leveig asecond spring compressible by relative movement of the rocking frame andthe pressure lever adapted to rotatethe pressure beam, and power meansfor causing movement of the pressure lever to compress the said secondspring.

2. In a clamp actuating device for" paper cutting machines, a clamp, arocking frame,

a link pivoted on the rocking frame; a pressure lever pivotally mountedon the rocking frame, a pressure beam having connecting means foractuating the clamp, means for actuating the pressure beam comprisin aspring exerting pressure between one en of the pressure lever and thelink and the pressure beam, and a second spring intermediate thepressure lever and the rocking frameto return the pressure lever tonormal position.

3.In a clamp actuating device for aper cutting machines, a clamp, arocking rame, a link pivoted on the rocking frame; a ressure leverpivotally mounted on the roc g frame, a pressure beam having connectingmeans for actuating the clamp and means for actuating the pressure beamcomprising a spring exerting pressure between one end of the pressurelever and the link, pull bars connectlng the link and the pressure beam,a second spring intermediate the pressure lever and the rocking frame toreturn the pressure lever to normal position, a ower driven cam foractuating said rocking rame and a brake to automatically hold the clampagainst'any back movement,

4. In a clamp actuating device for paper cutting machines, a clam arocking frame,

a link pivoted on the roc mg frame; a pressure lever pivotally mountedon the rocking frame, a pressure beam having connecting means foractuating the clamp,.and means for actuating the. pressure beamcomprising a spring exerting pressure between one end of the pressurelever and the link, pull bars connecting the link and the pressure beam,a second spring intermediate the pressure lever and the rocking frame toreturn'the pressure lever. to normal position, a power driven cam foractuating said rocking frame,

a brake pivotally mounted on the rocking frame, a spring to actuate thebrake, an

connecting mechanism intermediate the brake and pressure lever tocontrol the brake operation.

5. In a clamp actuating device for paper cutting machines, a clamp, arocking frame, a link pivoted on the rocking frame; a pressure leverpivotally mountd on the rocking frame,

a pressure beam having connecting means for actuating the clamp, meansfor actuating the pressure beam comprising a spring exerting pressurebetween one end of the pressure lever and the link, pull bars connectingthe link and the pressure beam, and a second spring intermediate thepressure lever and the rockin frame to return the pressure lever tonorrna position, a power driven cam for actuating said rocking frame, abrake pivotally mounted on the rocking frame, a spring to actuate samewhereby said brake will be set upon the compression of said spring, anda rod inter= mediate said brake and pressure lever to release said brakeupon the continued movement of the pressure lever.

' GHARLES SEYBGLD,

